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    Re: Calibrating a sextant scale
    From: Fred Hebard
    Date: 2007 Nov 21, 12:38 -0500

    On Nov 21, 2007, at 11:37 AM, Alexandre E Eremenko wrote:
    > Fred,
    >> Fred Hebard wrote:
    >>> The problem is getting a precise star-to-star
    >>> distances. I don't believe anybody claims to
    >>> have solved that
    >>> problem.
    > I am not sure that I understand which problem exactly
    > you address here. COMPUTING the star-to-star distances
    > for given moment at given position is not a problem at all.
    > With all corrections.
    > But MEASURING them with a sextant with sufficient
    > precision to obtain your sextant
    > calibration (arc correction)
    > seems (to me at least) a hopeless problem.
    > I spent several years, making hundreds of observations
    > trying to do this. It just does not work.
    > Alex.
    I agree.  That's what I was trying to say. I should have said, "The
    problem is MEASURING a precise star-to-star difference."  My only
    quibble is that you might rephrase your conclusion to, "I could not
    get it to work."  Maybe a more skilled observer than you or I might
    be able to get it to work.
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